Close friend Amanda Lloyd, who is accompanying Steve in hospital, said: "I was with Steve when he was admitted he was very worried but felt that exploratory operation
was the best course of action so we can hopefully get an answer to the series of health issues."
The Palace said in a statement on Thursday night: "His Royal Highness The Duke of Edinburgh has been admitted to the London Clinic for an exploratory operation
following abdominal investigations.
With Dan Gosling possibly facing an exploratory operation
on his injured knee, it is not the positive news that Pardew would have liked to relay from the club's training camp in Portugal.
Berbatov has been struggling with the injury since November and Ferguson revealed last week the advice has been for the pounds 30.75m forward to have an exploratory operation
so medical staff can work out the extent of the problem.
JOEY BARTON has kicked his last ball of 2009 after undergoing an exploratory operation
on his right foot.
The 26-year-old picked up the injury during a training session and an exploratory operation
has now confirmed the severity of the problem.
Flintoff had hoped to finally shrug off the injury and feature for Lancashire in the championship match against Sussex at Hove, only to be ruled out again on Wednesday morning and booked in for yesterday's exploratory operation
But former Coventry stalwart Mo Konjic is facing a five-week spell on the sidelines after undergoing an exploratory operation
on his troublesome knee.
The 63-year-old star, who has not smoked since the 60s, was diagnosed last month after doctors at London's Royal Marsden Hospital carried out an exploratory operation
Manchester United say the exploratory operation
will force Ferdinand to miss four, possibly five weeks.
A minor exploratory operation
will be needed to sort it out but that can wait until the summer.
Members of the Royal Family hope to visit the duke, who had the exploratory operation